Combined spark plug and suppressor



'Feb. 9, 1937. B. B. MINNIUM COMBINED SPARK PLUG AND SUPPRESSOR Filed March 14, I955 ar MW 771 INVENTOR.

Patented Feb. 9, 1931 UNITED STATES PATENT OFFICE tlon, Erie, Pa, a corporation of Pennsylvania Application March 14,1935, Serial No. 11.011

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pressors it it is desired to operate a radio set in.

relation to be disturbed by the system. The present invention is designed to simplify the A inclusion of the suppressors in the system and to that end provides for a suppressor in the spark plug. Where the suppressor is placed in the spark plug it is subjected to heat and it the suppressor element is one subjected to change in eii'ectiveness, or by reason of deterioration though the action of the heat it is desirable to so control the heat transfer to and from the element as to prevent an accumulation of excessive 16 heat in the element. Features and details oi. the invention willappear from the specification and claims. r

A preferred embodiment of the invention is illustrated .in the accompanying drawing which shows a central section through a spark plug with the suppressor in place. I

I marks the spark plugbody to which is attached one. 01' the electrodes 2 usually grounded through the engine,- and 3 the insulating shell usually of ceramic material, this shell extending through an opening 4 in the body. The shell has a shoulder 5 which,extends into a socket Sin the body and is secured in place by a screw-threaded plug 7. .An electrode 8 is set.

in. spaced relationto iorm a gap with the electrode 2 and extends through an opening 8 in the shell 4 into a cavity Ill. The usual terminal post II is arranged at the top of the-shell I and is secured in that shellby a screw-threaded end ii. A suppressor element It is provided with metallic connecting conductor ends M. A conductor It extends from the lowerend It to the upper end 0! the electrode 8. The uppe end of the electrode 8 is provided with ahead I to facilitate its connection with the-conductor I5. A conductor ll extends upwardly from the upper metallic and I4 through an opening I! in the terminal II. It is secured in the upper post, or terminal by solder, or other convenient means.

With this structure the element II is suspended in the cavity II. The lower conductor II has very small heat exchange capacity. This is eflected by utilizing a wire of very small gauge and preferably of material of small capacity for I heat exchange as coustantan and also by mak-. ing it of considerable length. The conductor l1 extending outwardly from the element II is s 01' ample heat conducting capacity and this is accomplished by a. comparatively large cross section of material-emcient i'or heat exchange and by making the span between the element and the-terminal comparatively short. Inthis 10 way the resistor element isprotected against an accumulation of heat that would be detrimental to its action. On the other hand the suppressor element is brought very close to the' v spark which is of advantage in a functional way 15 and is fully protected by the spark plug without any attention on the part of the operator-assembling the ignition system.

What I claim as new is: 1. A combined spark plug and suppressor com- 20 prising a spark plug having attached electrodes; a conductor leading from one of the electrodes to a conductor. terminal including a suppressor element within the spark plug; and conductois leading inwardly and outwardly from the ele- 25 ment, the inwardly leading conductor having small capacity for conducting heat to the element and the outwardly leading conductor hav ing a comparatively large capacity for conducting heat from the element, said element con- 30 ductors suspending the element in the spark Plug. v 2. A combined spark plug and suppressor comprising a spark plug having attached electrodes;

a conductor leading from one ofthe electrodes 35 to a conductor terminal including a suppressor element within the spark plug; and conductors leading inwardly and outwardly' from the element, :the inwardly leading conductor having small capacity for conducting heat to the element and the outwardly leading condl ictor havingv a comparatively large capacity for conduct--- ing heat from the element, said element conductors suspending the element in the spark 5 plug out of contact with the wallsof the sparkmug.-

' BYRON 

